Scale inhibiting and removing agent and preparation method thereof

The invention discloses a scale inhibiting and removing agent and a preparation method thereof, and belongs to the field of oilfield exploitation. The scale inhibiting and removing agent is prepared from the following components in parts by weight: 0.2 to 0.6 part of an anti-swelling agent, 0.013 to 0.021 part of a scale inhibitor, 0.004 to 0.005 part of methylated single macrocyclic polyamine, 0.01 to 0.02 part of a scale remover, 0.15 to 0.4 part of a dispersing agent and the balance of water. According to the preparation method, positive ions generated by dissociation of the anti-swelling agent are neutralized with electronegativity on the surface of the clay, so that the electrostatic repulsion of the clay is reduced, and the swelling of the clay is inhibited; calcium sulfate or calcium carbonate can be directly converted into water-soluble substances through the scale inhibitor, and combination of scale forming ions is avoided; calcium carbonate scale or calcium sulfate scale is dissolved through methyla